Packing ring



FIG. 1 shows a front view of a packing ring showing my new design;

FIG. 2 shows a rear view thereof;

FIG. 3 shows a right side view thereof;

FIG. 4 shows a left side view thereof;

FIG. 5 shows a top view thereof;

FIG. 6 shows a bottom view thereof; and,

FIG. 7 shows an enlarged cross-sectional view thereof, taken along line 7—7 in FIG. 1. 

The ornamental design for a packing ring, as shown and described. 